Which solution will meet this requirement with the LEAST effort?
Use the AWS Encryption SDK for encryption and decryption of the data before writing to the log group.
Use the AWS KMS console to associate the KMS key with the log group.
Use the AWS CLI aws logs create-log-group command, and specify the key Amazon Resource Name (ARN).
Use the AWS CLI aws logs associate-kms-key command, and specify the key Amazon Resource Name (ARN).
Explanations:
The AWS Encryption SDK is used for application-level encryption and requires manual implementation of encryption and decryption before logging data. This option involves more effort and is not necessary when AWS KMS can handle encryption automatically for CloudWatch Logs.
You cannot directly associate a KMS key with a CloudWatch log group using the AWS KMS console. The console does not provide an option to link KMS keys with existing log groups; this is done via API or CLI commands.
Theaws logs create-log-groupcommand is used to create a new log group and cannot be used to associate a KMS key with an existing log group. The option does not fulfill the requirement of encrypting log data in an already existing log group.
Theaws logs associate-kms-keycommand is specifically designed to associate a KMS key with an existing log group, enabling automatic encryption of future log data with minimal effort. This option meets the requirements and follows AWS best practices.
I opine that the answer is:
Use the AWS CLI aws logs associate-kms-key command, and specify the key Amazon Resource Name (ARN).